@misc{indiciaea785ea5084ce,
  title = {A random-walk model of hydraulic friction},
  author = {W. B. Langbein},
  year = {1966},
  doi = {10.1080/02626666609493455},
  url = {https://pubs.usgs.gov/publication/70221259},
  note = {Source identifier: 70221259}
}